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painless penial lesion

Hi,

2 days ago I discovered a small solitary lesion on the underside of my shaft during shower,  which kinda stung when in contact with water.

It doesnt hurt at all and looks like a tiny red bump (with shiny bottom),  sized around 0.2cm. No lymph node noticable around the groin area.

The last time I had intercourse was 16 days ago,  protected although the oral sex was not.

I also masturbate on a daily basis,  2-3 times a day.  Could this lesion possibly comes from over masturbation or it could be a STI like syphilis? If suspected to be syphilis, should I wait until the 3 weeks or 4 weeks mark to take the TPHA test for better accuracy?
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5536886 tn?1455827346
COMMUNITY LEADER
If it's just one small bump, it's probably just a sore- but for the most accurate diagnosis, you would want to see a doctor and consult them.  
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